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Re: Which grade oil should I use for my motor?
The cam in that old six has very low lift and "slow" ramps. Combined with low pressure springs, there's no way you have to worry about flattening a lobe.
Sorry if I offend anyone, but I just don't get these ZDDP additives. You'd think we were talking about adding hotter salsa to a taco! Lubrication engineers and chemists spend a lot of time and money developing additive packages for their oils, and we're supposed to just dump in some ZDDP Plus and assume it blends well with any and all oils? Seriously?
If your flat tappet cam lobe design and valve spring pressure dictate higher levels of ZDDP, then use an oil that has what you need as part of the additive package, like Driven Hot Rod oil. It ain't cheap oil, but it's cheap insurance. http://www.drivenracingoil.com/news/...ge-protection/
Good advice above from Chris at Shell, IMO. At least for a OE flat tappet cam and valve springs.
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Mike
1969 C10 LWB -- owned for 36 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes.
1982 C10 SWB -- converted from 250-six to roller cam 350, Vortec heads -- sold
1981 C10 Silverado LWB, 305, TH350C -- sold, but wish I still had it!
1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
Retired as a factory automation products salesman.
Worked part-time over the years for an engine builder and a classic car repair shop.
Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!
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